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Name	Antioxidant 24	EINECS	247-952-5
CAS No.	26741-53-7	Density	1.166[at 20℃]
PSA	82.56000	LogP	9.86820
Solubility	93μg/L at 25℃	Melting Point	160-178 °C
Formula	C₃₃H₅₀O₆P₂	Boiling Point	555.8 °C at 760 mmHg
Molecular Weight	604.704	Flash Point	363.9 °C
Transport Information	N/A	Appearance	White powder
Safety		Risk Codes	N/A
Molecular Structure		Hazard Symbols	N/A
Synonyms	Phosphorousacid, cyclic neopentanetetrayl bis(2,4-di-tert-butylphenyl) ester (8CI);2,4,8,10-Tetraoxa-3,9-diphosphaspiro[5.5]undecane,3,9-bis(2,4-di-tert-butylphenoxy)- (8CI);Phenol, 2,4-di-tert-butyl-,dihydrogen phosphite cyclic neopentanetetrayl ester (8CI);ADK Stab PEP 24;ADKStab PEP 24G;2,4,8,10-Tetraoxa-3,9-diphosphaspiro[5.5]undecane,3,9-bis[2,4-bis(1,1-dimethylethyl)phenoxy]-;Antioxidant 626;Cyclicneopentanetetrayl bis(2,4-di-tert-butylphenyl phosphite);Di(2,4-di-tert-butylphenyl)pentaerythritol diphosphite;Doverphos S 9432;Irgafos 126;Irgafos 126FF;Mark PEP 24;Mark PEP 24G;Phos 5;Songnox6260;Ultranox 2879A;Ultranox 624;Ultranox 626;Weston 626;Weston MDW 626;	Article Data	3

Antioxidant 24 Chemical Properties

IUPAC Name: 3,9-Bis(2,4-ditert-butylphenoxy)-2,4,8,10-tetraoxa-3, 9-diphosphaspiro[5.5]undecane
Molecular Formula: C₃₃H₅₀O₆P₂
Molecular Weight: 604.69 g/mol
SMILES: O2P(Oc1ccc(cc1C(C)(C)C)C(C)(C)C)OCC3(C2)COP(OC3)Oc4ccc(cc4C(C)(C)C)C(C)(C)C
InChI: InChI=1/C33H50O6P2/c1-29(2,3)23-13-15-27(25(17-23)31(7,8)9)38-40-34-19-33(20-35-40)21-36-41(37-22-33)39-28-16-14-24(30(4,5)6)18-26(28)32(10,11)12/h13-18H,19-22H2,1-12H3
EINECS: 247-952-5
Product Categories: Industrial / Fine Chemicals; Organics
Flash Point: 363.9 °C
Enthalpy of Vaporization: 80.6 kJ/mol
Boiling Point: 555.8 °C at 760 mmHg
Melting Point: 160-178 °C
Vapour Pressure of Antioxidant 24 (CAS NO.26741-53-7): 8.01E-12 mmHg at 25 °C

Antioxidant 24 Toxicity Data With Reference

1.	orl-rat LD50:5580 mg/kg	EPASR* United States Environmental Protection Agency, Office of Pesticides and Toxic Substances. (U.S. Environmental Protection Agency, 401M St., S.W., Washington, DC 20460) History Unknown 8EHQ-1287-0706 .
2.	ihl-rat LC50:>2 g/m3	EPASR* United States Environmental Protection Agency, Office of Pesticides and Toxic Substances. (U.S. Environmental Protection Agency, 401M St., S.W., Washington, DC 20460) History Unknown 8EHQ-1287-0706 .
3.	skn-rbt LD50:>200 mg/kg	EPASR* United States Environmental Protection Agency, Office of Pesticides and Toxic Substances. (U.S. Environmental Protection Agency, 401M St., S.W., Washington, DC 20460) History Unknown 8EHQ-1287-0706 .

Antioxidant 24 Consensus Reports

Reported in EPA TSCA Inventory.

Antioxidant 24 Safety Profile

Low toxicity by ingestion, inhalation, and skin contact. When heated to decomposition it emits toxic vapors of PO_x.

Antioxidant 24 Specification

Antioxidant 24 (CAS NO.26741-53-7), its Synonyms are 3,9-Bis(2,4-bis(1,1-dimethylethyl)phenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro(5.5)undecane ; ADK Stab PEP 24 ; Mark pep 24 ; Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite ; Ultranox 626 ; 3,9-Bis(2,4-di-tert-butylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane .

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